Facebook begins placing FBX ads in news feeds

Menlo Park, Calif.—Facebook Inc. has started placing ads from its FBX ad exchange in the news feeds of users, including retargeting ads from sites that users have previously visited.
Since its introduction in September, behaviorally targeted FBX ads, based on users' browsing habits across the Web, have only been available to advertisers in Facebook's right-hand rail. This new option will make those ads more prominent given Facebook's revamped design, unveiled earlier this month, which features a larger news feed and ad sizes.
The ads will link to sites that users have visited. The new ad units are not yet available for Facebook's mobile site.